Skeletal Muscles Upper Limb Practical

Question 1

deltoid

Answer 1

common site for intramuscular injection
prime mover of arm abduction
antagonist of pectoralis major and latissimus dorsi which adduct the arm
synergist of pectoralis major
causes extension and lateral rotation of arm
active during arm-swinging movements while walking.

Question 2

biceps brachii

Answer 2

flexes and supinates forearm
these actions usually occur at same time
weak flexor of arm at shoulder

Question 3

triceps brachii

Answer 3

powerful forearm extensor (prime mover, particularly medial head)
antagonist of forearm flexors

Question 4

flexor carpi radialis

Answer 4

powerful flexor and abductor of hand

weak synergist of elbow flexion

Question 5

palmaris longus

Answer 5

tenses skin and fascia of palm during hand movements
weak wrist flexor
weak synergist for elbow flexion

Question 6

flexor carpi ulnaris

Answer 6

powerful flexor and adductor of hand in synergy with extensor carpi ulnaris (posterior muscle)
stabilizes wrist during finger extension

Question 7

extensor carpi ulnaris

Answer 7

extends hand in conjunction with extensor carpi radialis

adducts hand in conjunction with flexor carpi ulnaris

Question 8

extensor digitorium

Answer 8

prime mover of finger extension
extends hand
can abduct (flare) fingers

Question 9

extensor carpi radialis longus

Answer 9

extends hand in conjunction with extensor carpi ulnaris and abducts hand in conjunction with flexor carpi radialis